[petsc-users] odd SNES behavior

[Peter Brune]

That's the thing; you WANT a MFFD matrix in the snes->jacobian slot but not
the snes->jacobian_pre slot.

Somewhere the PC's getting the wrong one and putting it on the smoother.

- Peter


On Wed, Mar 6, 2013 at 3:44 PM, Mark F. Adams <mark.adams at columbia.edu>wrote:

> >
> >  Yikes, the logic of SNES and MG (with dm etc) is getting a bit too
> convoluted. I would run in the debugger with a break point for
> MatCreate_MFFD() this will give a hint why it is being used.
> >
>
> #0  0x0000000100fca059 in MatCreate_MFFD ()
> #1  0x0000000100eedc34 in MatSetType ()
> #2  0x0000000100fc7bc3 in MatCreateMFFD ()
> #3  0x00000001012acc90 in MatCreateSNESMF ()
> #4  0x00000001012c092e in SNESSetUp ()
> #5  0x00000001012c277b in SNESSolve ()
>
> I will keep digging.  This is the first one and it is not in the PC ...
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